Flash lamp



April 18, KQBAYASH| FLASH LAMP Filed May 9, 1932.

.ZZVI ENT UR KEJSHJR U K UEAYASHZ Patented Apr. 18, 1933 UNITED STATES PATENT OFFICE ZEISHIBO KOIBAYASHI, OF TOKYO, JAPAN, ASSIGNOR '10 GENERALELECMIG COMPANY,

' A CORPORATION OF NEW YORK LAMP Application filed Kay 9, 1932, Serial l lo. 810,286, and in Japan lay 28, 1931.

My invention relates to flash lamps and more particularly to flash lamps used for photographic purposes. Still more particuularly my invention relates to ignition means therefor.

Flash lamps are already known in which metically sealed and containing a flashing medium and an ignition means located in said bulb comprising an inflammable substance and a heat conductor in contact therewith extending through said bulb and having a portion thereof extending beyond said an oxidizable metal in the form of a ribbon b lb or foil is placed in a transparent bulb filled with oxygen or an oxygen gas mixture. The ignition of the combustible in the known lamps is accomplished by electrically heating up a filament carrying a fulminating substance thereon. This method of ignition requires of course the use of a source of electricity, such as house current or a separate battery. One of the objects of my invention is the provision of means for igniting the combustible which will be simple and will eliminate auxiliary apparatus.

Other features andadvantages of .my invention will appear from the following description of species thereof.

The single re of the drawing is a view in elevation, with a part of the glass bulb broken away so as to expose its contents.

Referring to the drawing, my invention comprises a glass bulb 10 and a loose filling of a combustible material 11 therein consisting preferably of a thin foil or ribbon of metal such as aluminum or magnesium. The bulb 10 contains a filling of a gas that supports combustion, preferably oxygen or a gas that generates oxygen. A wire 12 of metal having a high heat conductivity such as copper is sealed in one end of the bulb 10 and projects into said bulb and terminates on the outside of the bulb preferably in the form of a spiral. The inward projecting end of the 2. A flash lamp comprising a bulb hermetically sealed and containing a metal foil and an ignition means located in said bulb comprising an inflammable substance and a heat conductor in contact therewith extending through said bulb and having a portion thereof extending beyond said bulb.

In witness whereof, I have hereunto set my hand.

KEISHIRO KOBAYASHI.

wire 12 carries a highly inflammable sub- 

